parallax second
短语发音
US
词形变化
parallax seconds
复数
parallax seconds
别名
psc
释义与例句
n.
-
1.
A unit of length, used in astronomy, defined as the distance from the Earth of an object that exhibits a parallax of 1 arcsecond. It is approximately equal to 3.08568025 × 10¹³ kilometers or 3.2616 light years.